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Ben with SCT's and narks it's a matter of the clear aperture of the back of the mirror cell being large enough to fill the field of a 2" eyepiece which may have a field stop of 47mm diameter.
On a C8 - or smaller SCT's - the back is too small to fill such eyepieces.
If you don't believe me, I'd be happy to show you what happens if I plop the 42mm LVW on a small C5 or Meade 6".
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